Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions triggered by specific posts, overloading the server and leading to a denial-of-service (DoS) condition.
Fixes

Solution

Update Mattermost to versions 10.6.0, 10.4.3, 10.5.1, 9.11.11 or higher. Alternatively, update the Mattermost Playbooks plugin to version 2.1.1 or higher.


Workaround

No workaround given by the vendor.

References
History

Mon, 29 Sep 2025 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.5.0:-:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server

Thu, 24 Apr 2025 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 24 Apr 2025 07:00:00 +0000

Type Values Removed Values Added
Description Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions triggered by specific posts, overloading the server and leading to a denial-of-service (DoS) condition.
Title DoS in Mattermost Playbooks via Excessive Task Actions
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-04-24T13:06:59.413Z

Reserved: 2025-04-22T11:38:20.801Z

Link: CVE-2025-35965

cve-icon Vulnrichment

Updated: 2025-04-24T13:04:02.271Z

cve-icon NVD

Status : Analyzed

Published: 2025-04-24T07:15:31.280

Modified: 2025-09-29T21:10:29.280

Link: CVE-2025-35965

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-07-13T11:06:43Z